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Inorganic Chemical
An inorganic chemical reaction describes a chemical reaction of an inorganic compound.There are four main categories of inorganic chemical reactions:

  •  Combination Reactions
  •  Decomposition Reactions
  •  Single Displacement Reactions
  •  Double Displacement Reactions

Combination Reactions
A Combination Reaction or a Synthesis Reaction is a general category of a chemical reaction (the term usually refers to an inorganic chemical reaction), in which two or more reagents are chemically bonded together to produce a single product. For example, the addition of sulphur and iron to form iron sulphide is a combination reaction.A combination reaction can be of three types:

  • Between 2 elements
  • Between 2 compounds
  • Between an element and a compound


  • 2Mg+O2 → 2Mg0
  • CaO+H2O → Ca(OH)2
  • 2CO+O2 → 2CO2

Chemical Decompostion
Chemical decomposition or analysis is the fragmentation of a chemical compound into elements or smaller compounds. It is sometimes defined as the opposite of a chemical synthesis. Chemical decomposition is often an undesired chemical reaction. The stability that a chemical compound ordinarily has is eventually limited when exposed to extreme environmental conditions like heat, radiation, humidity or the acidity of a solvent. The details of decomposition processes are generally not well defined, as a molecule may break up into a host of smaller fragments. Chemical decomposition is exploited in several analytical techniques, notably mass spectrometry, traditional gravimetric analysis, and thermogravimetric analysis.

Single Displacement Reaction
A single-displacement reaction, also called single-replacement reaction, is when one element appears to move out of one compound and into another.

Double Displacement Reactions
Metathesis is a bimolecular process involving the exchange of bonds between the two reacting chemical species, which results in the creation of products with similar or identical bonding affiliations.

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